[PATCH 0/2] Fix boot regression for s390 and remove break_lock

From: Will Deacon <will.deacon@arm.com>
To: linux-kernel@vger.kernel.org
Cc: sebott@linux.vnet.ibm.com, schwidefsky@de.ibm.com,
	heiko.carstens@de.ibm.com, peterz@infradead.org,
	mingo@kernel.org, Will Deacon <will.deacon@arm.com>
Subject: [PATCH 0/2] Fix boot regression for s390 and remove break_lock
Date: Tue, 28 Nov 2017 18:42:17 +0000	[thread overview]
Message-ID: <1511894539-7988-1-git-send-email-will.deacon@arm.com> (raw)

Hi all,

The following two patches do the following:

  1. Fix boot breakage reported on s390 caused by a8a217c22116
  2. Kill off the break_lock field entirely, since it's not actually
     that useful

I didn't go the whole hog and remove CONFIG_GENERIC_LOCKBREAK, since the
"do something different with locks in preemptible kernels" isn't necessarily
a bad idea, and PowerPC actually implements things like arch_spin_relax
for that.

The first patch should go in to 4.15.

Thanks,

Will

--->8

Will Deacon (2):
  locking/core: Fix deadlock during boot on systems with
    GENERIC_LOCKBREAK
  locking/core: Remove break_lock field when CONFIG_GENERIC_LOCKBREAK=y

 include/linux/rwlock_types.h   |  3 ---
 include/linux/spinlock.h       |  5 -----
 include/linux/spinlock_types.h |  3 ---
 kernel/locking/spinlock.c      | 13 +++----------
 4 files changed, 3 insertions(+), 21 deletions(-)

-- 
2.1.4